河臺金礦
河臺金礦（產(chǎn)于元古宙變碎屑巖、泥質(zhì)巖、碳酸鹽巖中的金礦構(gòu)造蝕變巖型亞類）。
河臺金礦發(fā)現(xiàn)于1982年7月，位于高要縣境內(nèi)。它的發(fā)現(xiàn)，為在華南地區(qū)前泥盆紀地層，特別是混合巖化變質(zhì)巖系中尋找同類礦床提供了范例。
在大地構(gòu)造位置上，礦區(qū)位于吳川－四會斷裂帶與那蓬－悅城斷裂帶的交匯部位，礦區(qū)由震旦系Ｃ組混合巖化片巖、變粒巖、片麻巖、混合花崗巖組成，南側(cè)為志留系和奧陶系淺變質(zhì)的復(fù)理石建造。兩者呈斷層接觸，含金千糜巖帶賦存于斷層北側(cè)的混合巖化巖石和混合巖內(nèi)（圖4）。Zc 組巖石主要有二云母石英片巖、云母片巖和少量黑云母變粒巖、片麻巖等。片巖中普遍含夕線石。由于混合巖化作用普遍，因此常見新生的斜長石和微斜長石呈眼球狀沿片理分布。
River gold deposit
Hetai Gold (gold deposit tectonic alteration produced in Proterozoic metamorphic clastic rock, mudstone, carbonate rock type in the subclass).
He found in July 1982, located in the territory of the county. It is found that, in the South China area pre Devonian strata, especially migmatization metamorphic rock series in looking for similar deposits provides an example.
On the tectonic position. The mine is located in the Wuchuan - Sihui fracture band and that Peng - Yue City fracture with the intersection, mining area by Sinian C group migmatite schists, granulite and gneiss, mixed granite composition, on the south side of the Silurian and Ordovician shallow metamorphic flysch, stone built building. There is gold bearing fault contact, phyllonite zone occurs in the fault on the north side of the migmatitic rocks and mixed rocks (Figure 4). Group Zc rocks mainly have two mica quartz schist, mica schist and minor biotite granulite gneiss, etc.. Sillimanite commonly contain schist. Due to widespread migmatization, so common new plagioclase and microcline was augen along foliation distribution. |
